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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities    
Net loss $ (26.9) $ (24.2)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 9.9 6.0
Share-based compensation 25.0 24.6
Non-cash interest expense 12.2 3.7
Income (loss) from equity investments 4.2 (7.4)
Other non-cash income and expenses 0.3 (0.9)
Changes in operating assets and liabilities:    
Accounts receivable, net 21.5 10.7
Inventory (30.4) (6.4)
Prepaid and other assets (5.4) (2.7)
Accounts payable and accrued liabilities 25.5 2.2
Accrued payroll and related expenses (21.1) (14.4)
Deferred revenue, deferred rent, and other liabilities (3.0) 0.1
Net cash provided by (used in) operating activities 11.8 (8.7)
Investing activities    
Purchase of marketable securities (50.7) (32.0)
Proceeds from sale and maturity of marketable securities 222.5 32.9
Purchase of other equity investments (1.2) (1.0)
Purchase of property and equipment (39.3) (15.3)
Net cash provided by (used in) investing activities 131.3 (15.4)
Financing activities    
Net proceeds from issuance of common stock 5.0 4.2
Other financing activities (0.1) 0.0
Net cash provided by financing activities 4.9 4.2
Effect of exchange rate changes on cash, cash equivalents and restricted cash 0.6 (0.9)
Increase (decrease) in cash, cash equivalents and restricted cash 148.6 (20.8)
Cash, cash equivalents and restricted cash, beginning of period 1,137.1 441.5
Cash, cash equivalents and restricted cash, end of period 1,285.7 420.7
Reconciliation of cash, cash equivalents and restricted cash, end of period:    
Cash and cash equivalents 1,285.1 420.4
Restricted cash 0.6 0.3
Supplemental disclosure of non-cash investing and financing transactions:    
Acquisition of property and equipment included in accounts payable and accrued liabilities 10.1 $ 4.3
Right-of-use assets obtained in exchange for lease liabilities $ 45.2